For anyone that wants to post pics, Dropbox is a good option - Dropbox an excellent App in it's own right, it's free, and is very useful for storing or transferring stuff from and to your iPhone/iPad.
App Linky: http://itunes.apple.com/gb/app/dropbox/id327630330?mt=8
For picture posting, you can upload screendumps to your Dropbox account, and if you then move it into the public folder you can get a 'public link' which you can then paste here inside the [img] tags.
Using image tags is easy peasy lemon squeezy... [img]dropbox_link_goes_here[/img]